Simple Mag Child Theme "Add Media" to posts non-functional

No users who have access to the dashboard are able to “Add Media” to any posts. This is accross the board in browsers and platforms. We are using a slightly (CSS only) customized Simple Mag Child Theme, and we have updated our WordPress version to 3.8.
This is urgent, as this effectively leaves us dead in the water if we cannot upload any images along with our articles.
Thank you,
Neil

For specific pre-sales questions, you can interact directly with the author here. If you’ve already purchased the theme and need further assistance, don’t forget to post from the buyer account instead. Thanks.